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The data given below are for the adsorption of nitrogen on alumina at 77.3 K. Show...

The data given below are for the adsorption of nitrogen on alumina at 77.3 K. Show that they fit in a BET isotherm in the range of adsorption and find Vmono and hence surface area of alumina (m2 g-1). At 77.3 K, saturation pressure, P* = 733.59 torr. The volumes are corrected to STP and refer to 1 g of alumina. The area occupied by a nitrogen molecule at -195 °C estimated to be     16.2

x 10-20 m2.

P/ (torr)

37.67

74.20

114.54

142.0

185.34

V (cm3 g-1: STP)

23.14

28.1

33.1

36.35

41.49

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